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Chase Research CC4 Operating Instruction

Continuous 4he sorption cooler
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4
CONTINUOUS
He SORPTION COOLER
TYPE CC4
GENERIC INSTALLATION AND OPERATING INSTRUCTIONS
Photo shows a typical CRC CC4 sorption cooler
CRC Ltd, Cool Works, Unit 2 Neepsend Ind. Est., Parkwood Rd, Sheffield S3 8AG, UK.
Tel: +44 114 278 0711
Director: Dr. S.T. Chase
Secretary: Dr. L.C. Kenny
Registered in England & Wales, No. 4643351
VAT registration No. GB 763 8558 84

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Summary of Contents for Chase Research CC4

  • Page 1 He SORPTION COOLER TYPE CC4 GENERIC INSTALLATION AND OPERATING INSTRUCTIONS Photo shows a typical CRC CC4 sorption cooler CRC Ltd, Cool Works, Unit 2 Neepsend Ind. Est., Parkwood Rd, Sheffield S3 8AG, UK. Tel: +44 114 278 0711 Director: Dr. S.T. Chase Secretary: Dr.

  • Page 2: Table Of Contents

    OPERATIONAL SEQUENCE FOR INITIAL COOLDOWN AND EXTENDED OPERATION ..15 THIS GENERIC OPERATING MANUAL describes how to install and operate a CRC CC4 sorption cooler. It is accompanied by an Excel file that contains the validation test data and the calibration files that are specific to the sorption cooler unit that you have purchased.

  • Page 3: General Handling

    NOT be in place. When picking the sorption cooler up, it should be firmly grasped by the main plate. 2. SAFETY OF CHASE RESEARCH CRYOGENICS PRODUCTS 2.1. Pressure Equipment Directive 97/23/EC (Pressure Equipment Regulations 1999) This CRC sorption cooler unit is manufactured in accordance with Sound Engineering Practice. The volume and gas pressure within the sorption cooler are such that the equipment falls below the lower classification limit in Annex II of the Pressure Equipment Directive.

  • Page 4: Safe Operation

    Risks without controls in place It is extremely unlikely that the above events will lead to danger. Chase Research Cryogenics Ltd has produced more than two hundred sorption cooler units of various designs, which are in use for a range of applications worldwide.
  • Page 5 2.5. Safe Transportation The unit must be correctly re-installed in its shipping brace before transportation either by road or air. Follow the unpacking instructions provided in reverse order and contact CRC for advice if needed. The cooler+brace should be securely packed into the cooler’s rigid shipping box, which contains polystyrene or similar cushioning material to firmly hold the unit and prevent any movement within the box.

  • Page 6: A Brief Description Of The Sorption Cooler Unit

    3. A BRIEF DESCRIPTION OF THE SORPTION COOLER UNIT The CC4 sorption cooler is shown in the figure below. Continuous cooling of the 1K cold head is achieved by alternately cycling the two He module at intervals, such that the 1K cold head is always being cooled by one of the modules.

  • Page 7: Installation

    4. INSTALLATION 4.1. Mechanical Before installing the unit in your cryostat, be sure to carefully remove any pieces of foam packing from around the pumps, as mentioned in the unpacking instructions. There should be no need to touch the heat switches or heat straps during installation or normal operation of the sorption cooler.

  • Page 8: Electrical

    All electrical connections are brought out to stack of three MDM-SSP connectors (2 x 15 pin, 1 x 9 pin) mounted onto the main plate. Pin-outs are listed at the end of this instruction manual. The table below summarises the temperature sensors installed on the CC4. ITEM...

  • Page 9: Attaching Your Experiment To The Sorption Cooler

    CC4 and there are different optimisation strategies that are possible, depending on whether low temperature or temperature stability is more important. This is discussed further in Section 7.

  • Page 10: Operation: Quick-Start Guide

    6. OPERATION: QUICK-START GUIDE 6.1. Cooldown and commence continuous operation The basic cooldown steps for the CC4 are as follows: • Turn on the GM cryocooler and wait unit both heat switches have turned off. • Turn on the pump heaters to keep both pumps warm (around 45K) until both 4-heads and the 1K-head are cold (4K or below) •...

  • Page 11: Optimising The Performance Of Your Sorption Cooler

    6.2 Established alternate cycling for continuous operation. The cycle time that is optimum for your CC4 will depend on your cryocooler’s power and the heat load that your experiment imposes, but is likely to be in the range 30-100 minutes. The examples in this manual use 100 minutes cycle time.

  • Page 12: Varying The Cycle Steps

    Figure 3 shows an example of a cycling sequence (100 minute cycle time) optimised to give a low base temperature for the CC4. In this example the pump heaters are turned on gently at first, and they are turned off as soon as the 4-heads stop cooling rapidly. This minimises the heat loading on the CC4.

  • Page 13: Pid Stabilisation Of The Cc4

    This means that the heat loading on the CC4 is greater overall, however the rate of heat transfer to the main plate when the cycle is switched is reduced, meaning that the temperature fluctuations transmitted to the 1K- head are also reduced.

  • Page 14: Standard Pin-Out Assignments

    9. STANDARD PIN-OUT ASSIGNMENTS He4 modules female 15 pin Drive current Function TYPE PIN # or voltage 100nA AC RTD THERMOMETER V+ Or low voltage generic 6951 RTD THERMOMETER V- Driver RTD THERMOMETER I+ e.g. V<0.5mV RTD THERMOMETER I- not used DC2018 10A PUMP DIODE I+...

  • Page 15: Cc4 Operational Sequence For Initial Cooldown And Extended Operation

    10. CC4 OPERATIONAL SEQUENCE FOR INITIAL COOLDOWN AND EXTENDED OPERATION Pump Pump Step Working status Notes Heat Heat heater heater switch switch Wait for both heat Pre-cooling with GM/PT switches to turn off Wait until both 4- Heat both pumps to ~45 K, turn...

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